Astron. Astrophys. 343, 990-996 (1999)

Acknowledgements

B.R. and W.A.D. thank Copernicus Astronomical Center in Warsaw and Istituto Nazionale di Fisica Nucleare, respectively, for the hospitality. This research was supported by Ministero dell'Università e Ricerca Scientifica (MURST) through grant 40% 1998 and by the Polish grant KBN-2P03D-014.

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999
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